INSTALLATION INSTRUCTIONS ENERGY RECOVERY VENTILATOR WITH EXHAUST MODELS: WFERV. Bard Manufacturing Company, Inc.

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1 INSTALLATION INSTRUCTIONS ENERGY RECOVERY VENTILATOR WITH EXHAUST MODELS: WFERV Bard Manufacturing Company, Inc. Bryan, Ohio 4356 Since Moving ahead, just as planned. Manual: Supersedes: NEW File: Volume III, Tab 19 Date: Manual Page 1 of 21

2 CONTENTS Model Nomenclature Legend... 3 Electrical Specifications... 3 General Description... 3 General Information... 3 Unpacking... 3 Performance and Application Data - WFERV... 4 Basic Installation (Field Installation)... 5 & 6 Basic Installation (Factory Installed Versions) Control Wiring Control Requirements Recommended Control Sequences Ventilation Airflow Energy Recovery Ventilator Maintenance Maintenance Procedures Quarterly & Annual Maintenance Wiring Diagram Figures Figure 1 Intake Hood Assembly... 6 Figure 2 Remove Vent Option Door... 7 Figure 3 Filter & Exhaust Plate Location... 8 Figure 4 Installation of Exhaust Blower Assembly... 9 Figure 5 Installation of WFERV... 1 Figure 6 WFERV Assembly...11 Figure 7 Wiring - 23 Volt Figure 8 Installation of Fresh Air Intake Hood Assembly Figure 9 Operation of Unit with WFERV Figure 1 Thermostat Wiring Figure 11 Terminal Block Location Diagram Figure 12 Hub Assembly with Ball Bearings... 2 Tables Table 1 Ventilation Air (CFM) COPYRIGHT SEPTEMBER 27 BARD MANUFACTURING COMPANY, INC. BRYAN, OHIO USA 4356 Manufactured under the following U.S. patent numbers: 5,485,878; 5,23,116; 4,924,934; 4,875,52; 4,825,936 Manual Page 2 of 21

3 MODEL NOMENCLATURE LEGEND WF ERV A WF = Wall Mount Gas Furnace Energy Recovery Ventilator Electrical A = 23/28 Volt ELECTRICAL SPECIFICATIONS Model Voltage Amps Control Voltage WFERV 23/ V GENERAL DESCRIPTION The Energy Recovery Ventilator was designed to provide energy efficient, cost effective ventilation to meet I.A.Q. (Indoor Air Quality) requirements while still maintaining good indoor comfort and humidity control for a variety of applications such as schools, classrooms, lounges, conference rooms, beauty salons and others. It provides a constant supply of fresh air for control of airborne pollutants including CO 2, smoke, radon, formaldehyde, excess moisture, virus and bacteria. The ventilator incorporates patented rotary heat exchanger technology to remove both heat and moisture. It is designed as a single package, which can be easily factory or field installed for new installations or retrofit to Bard WF wall mounted units. The package consists of a unique rotary Energy Recovery Cassette that can be easily removed for cleaning or maintenance. The cassette has a 21-inch diameter heat transfer wheel for efficient heat transfer. The heat transfer wheel uses a permanently bonded dry desiccant coating for total heat recovery. Ventilation is accomplished with two (2) blower/motor assemblies each consisting of a drive motor and dual blowers for maximum ventilation at low sound levels. On non-independent motor control models, the air is exhausted at the same rate that fresh air is brought into the structure, thus not impacting building pressure. On independent motor control models, the air can be exhausted at a different rate than the intake or fresh air. Never operate the fresh air at a lower speed than the exhaust air. Operating the fresh air at a higher speed than the exhaust air will help maintain a slight positive pressure in the building. The rotating energy wheel provides the heat transfer effectively during both summer and winter conditions. Provides required ventilation to meet the requirements of ASHRAE standard. NOTE: Never set intake blower at a lower speed than the exhaust blower, as it will create a negative pressure in the room. During operation below 5 degrees F outdoor temperature, freezing of moisture in the heat transfer wheel can occur. Consult the factory if this possibility exists. GENERAL INFORMATION The ventilator should only be installed by a trained heating and air conditioning technician. These instructions serve as a guide to the technician installing the ventilator package. They are not intended as a stepby-step procedure with which the mechanically-inclined owner can install the package. The ventilator housing is shipped in one carton, which contains the following: 1. Energy Recovery Ventilator 2. Service Door 3. Rain Hood and Mist Eliminator 4. Installation Instructions UNPACKING Upon receipt of the equipment, be sure to compare the model number found on the shipping label with the accessory identification information on the ordering and shipping document to verify that the correct accessory has been shipped. Inspect the carton housing of each ventilator as it is received, and before signing the freight bill, verify that all items have been received and that there is no visible damage. Note any shortages or damage on all copies of the freight bill. The receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier s agent. Concealed damage not discovered until after loading must be reported to the carrier within 15 days of its receipt. Manual Page 3 of 21

4 Ambient O.D. DB/ WB F VLT VENTILATION RATE 45 CFM High Speed (Black) 72% EFFICIENCY VLS VLL HRT APPLICATION DATA WFERV SUMMER COOLING PERFORMANCE (INDOOR DESIGN CONDITIONS 75 DB/63 WB) HRS HRL VLT VENTILATION RATE 37 CFM Medium Speed (Blue) 73% EFFICIENCY VLS VLL HRT HRS HRL VLT VENTILATION RATE 28 CFM Low Speed (Red) 74% EFFICIENCY VLS VLL HRT HRS HRL WINTER HEATING PERFORMANCE (INDOOR DESIGN CONDITIONS 7 F DB) VENTILATION RATE Ambient O.D. DB F 45 CFM 76% EFF. WVL WHR 37 CFM 78% EFF. WVL WHR 28 CFM 8% EFF. WVL WHR LEGEND: VLT = Ventilation Load Total VLS = Ventilation Load Sensible VLL = Ventilation Load Latent HRT = Heat Recover Total HRS = Heat Recovery Sensible HRL = Heat Recovery Latent WVL = Winter Ventilation Load WHR = Winter Heat Recovery NOTE: Sensible performance only is shown for winter application Manual Page 4 of 21

5 BASIC INSTALLATION (Field Installation) 1. Unpack the ventilator assembly, which includes the integral ventilator with attached electrical harness and miscellaneous hardware. Model WARNING Open breaker switch before installing this accessory to prevent injury or death due to electrical shock or contact with moving parts. Turn thermostat to OFF. For Use With Following Units WFERV WF5-125 Electrical 23/28-1 or 3 phase 2. Remove intake hood assembly from back of ventilator. (See Figure 1.) 3. Remove the existing exterior vent option door on the unit. (See Figure 2.) 4. Remove and save existing unit air filter. Remove and discard the rear exhaust cover plate and remove center screw from condenser grille. (See Figure 3.) 5. Install exhaust blower assembly in rear exhaust opening and secure with four (4) screws. Position 4 pin connector so it is accessible. (See Figure 4.) 6. Install ventilator into the unit. (See Figure 5.) IMPORTANT NOTE: Position front lip of ventilator over front grille and on top of condenser partition. (See Figure 5.) This is important to insure proper drainage of any water entering damper assembly. 7. Remove cassette and plug in exhaust blower. Replace cassette. (See Figure 6.) 8. Open control panel to gain access to unit low voltage terminal block. (Insure all power is OFF prior to opening the control panel.) 9. Remove female plug of low voltage wiring harness from the heat recovery assembly and snap into filter rack. Route electrical harness leads through the 7/8" bushing into the low voltage box. (See Figure 5.) 1. Connect leads C (black), W (blue), and G (orange) with fork terminal to corresponding points on terminal strip. (See Figure 7 for 23V units.) NOTE: These 24 volt control wires control the starting and stopping of the Energy Recovery Ventilator and can be independently controlled by an energy management control or timer. See separate section on Control Wiring for suggested control schemes. 11. Remove female plug of high voltage wiring harness from the heat recover assembly and snap into filter rack. Wire to terminal block. (See Figure 7 for 23V units.) 12. Plug male plug from female at filter rack. (See Figure 5.) 13. Close control panel cover. 14. Replace filter and one (1) screw in condenser grille. (See Figure 3) 15. Ventilator checkout A. Resupply power to unit. B. Energize the evaporator blower by switching thermostat to the manual fan position with Heat/Cool in OFF position. C. Ventilator heat transfer wheels should rotate slowly (49 RPM). Intake and exhaust blowers should run. (See Figure 9.) D. De-energize the evaporator blower. Energy Recovery wheels, and fresh air and exhaust air blowers should stop. E. This completes ventilator checkout. Manual Page 5 of 21

6 16. Disconnect the wires connected in Step 1 if other control options are to be used. 17. Replace the lower service access panel with the new panel provided. Attach air intake hood with screws provided. (See Figure 9.) Be sure to insert the top flange of the air intake hood into and through the slot in the service door and between the door and insulation to prevent bowing of the door. 18. Close front door. 19. Apply Certification label, included with Installation Instructions, next to unit Serial Plate. 19. Ventilator is now ready for operation. FIGURE 1 INTAKE HOOD ASSEMBLY Manual Page 6 of 21

7 FIGURE 2 REMOVE VENT OPTION DOOR FRONT DOOR VENT OPTION DOOR EXHAUST COVER PLATES MIS-235 Manual Page 7 of 21

8 FIGURE 3 FILTER AND EXHAUST PLATE LOCATION FRONT DOOR REAR EXHAUST FILL PLATE FRONT EXHAUST FILL PLATE FILTER SCREW MIS-2345 Manual Page 8 of 21

9 FIGURE 4 INSTALLATION OF EXHAUST BLOWER ASSEMBLY FASTEN ASSEMBLY TO CONDENSER PARTITION WITH (4) SCREWS DO NOT REMOVE FRONT PLATE LOWER WFERV ASSEMBLY LOCATING HOLES RIGHT SIDE ATTATCH EXHAUST BLOWER ENCLOSER WITH SCREWS PROVIDED AS SHOWN. MIS-2353 Manual Page 9 of 21

10 Manual Page 1 of 21 FIGURE 5 INSTALLATION OF WFERV

11 FIGURE 6 WFERV ASSEMBLY Manual Page 11 of 21

12 FIGURE 7 WIRING 23 VOLT 23 VOLT WIRES INSERTED WITH BLOWER WIRES, CONNECT WIRES TO "L1" AND "L2" ON CONTROL BOARD AS SHOWN ON WIRING DIAGRAM GROUND WIRE CONNECT LOW VOLTAGE WIRES TO "C", "W1", AND "G" AS SHOWN ON WIRING DIAGRAM MIS-2356 Manual Page 12 of 21

13 FIGURE 8 INSTALLATION OF FRESH AIR INTAKE HOOD ASSEMBLY Manual Page 13 of 21

14 FIGURE 9 OPERATION OF UNIT WITH WFERV INSTALLED GAS MANIFOLD TOP BURNER BOX INDUCER DRAFT BLOWER SUPPLY AIR EXHAUST HOOD EXHAUST AIR GAS VALVE INDOOR (COMFORT AIR) BLOWER INTAKE AIR HOOD INTAKE AIR FILTER INTAKE BLOWER WFERV HOOD RETURN AIR FRESH AIR WERV CASSETTE EXHAUST BLOWER MIS-2369 Manual Page 14 of 21

15 BASIC INSTALLATION (FACTORY INSTALLED VERSIONS) 1. Remove air intake hood from return air area of unit. (See Figure 1.) 2. Install air intake hood. Refer to Item 17 of Basic Installation (Field Installation). 3. Refer to Control Wiring section for suggested control schemes for the WFERV. 4. After wiring, replace all panels. CONTROL WIRING The WFERV comes from the factory with the low voltage control wires wired into the wall mount low voltage terminal strip (see wiring diagrams). Care must be taken when deciding how to control the operation of the ventilator. When designing the control circuit for the ventilator, the following requirements must be met. CONTROL REQUIREMENTS 1. Indoor blower motor must be run whenever the WFERV is run. 2. Select the correct motor speed tap in the WFERV. Using Table 1 of the WFERV Installation Instructions, determine the motor speed needed to get the desired amount of ventilation air needed. For instance, do not use the high speed tap on a WFERV if only 2 CFM of ventilation air is needed. Use the low speed tap. Using the high speed tap would serve no useful purpose and significantly affect the overall efficiency of the system. System operating cost would also increase. 3. Run the WFERV only during periods when the conditioned space is occupied. Running the WFERV during unoccupied periods wastes energy, decreases the expected life of the WFERV, and can result in a large moisture buildup in the structure. The WFERV removes 6 to 7% of the moisture in the incoming air, not 1% of it. Running the WFERV when the structure is unoccupied allows moisture to build up in the structure because there is little or no load. Use a control system that in some way can control the system based on occupancy. * * IMPORTANT * * Operating the WFERV during unoccupied periods can result in a build up of moisture in the structure. RECOMMENDED CONTROL SEQUENCES Several possible control scenarios are listed below: 1. Use a programmable electronic thermostat with auxiliary terminal to control the WFERV based on daily programmed occupance periods. 2. Use a motion sensor in conjunction with a mechanical thermostat to determine occupancy in the structure. Bard markets the CS2 for this use. 3. Use a DDC control system to control the WFERV based on a room occupancy schedule to control the WFERV. 4. Tie the operation of the WFERV into the light switch. The lights in a room are usually on only when occupied. 5. Use a manual timer that the occupants turn to energize the WFERV for a specific number of hours. 6. Use a programmable mechanical timer to energize the WFERV and indoor blower during occupied periods of the day. VENTILATION AIRFLOW The 24 volt WFERV is equipped with a 3-speed motor to provide the capability of adjusting the ventilation rates to the requirements of the specific application by simply changing motor speeds. Manual Page 15 of 21

16 Model TABLE 1 VENTILATION AIR (CFM) VENTILATION AIR High Speed (Black) (CFM) Med. Speed (Blue) Low Speed (Red) WFERV All units are factory set on High speed and can be field adjusted for lower speeds if required. 24-Volt Units (Single switch models): The speed of both blowers (intake and exhaust) can be controlled by a switch located on the left side of the control panel, behind the WFERV front door. 24-Volt Units (Dual switch models): The speed of each blower (intake and exhaust) can be controlled independently by two (2) switches located on the left side of the control panel, behind the WFERV front door. The switch located on the upper part of the control panel controls the intake blower located in the upper assembly. The switch located on the lower part of the control panel controls the exhaust blower located in the lower assembly. See Figure 6. If desired, the intake blower can be set up for one speed and the exhaust blower set up for another speed if needed for the specific application. WARNING Open circuit breaker to shut all power OFF before doing this. Failure to do so could result in injury or death due to electrical shock. ENERGY RECOVERY VENTILATOR MAINTENANCE GENERAL INFORMATION The ability to clean exposed surfaces within air moving systems is an important design consideration for the maintenance of system performance and air quality. The need for periodic cleaning will be a function of operating schedule, climate, and contaminants in the indoor air being exhausted and in the outdoor air being supplied to the building. All components exposed to the airstream, including energy recovery wheels, may require cleaning in most applications. Rotary counterflow heat exchanges (heat wheels) with laminar airflow are self-cleaning with respect to dry particles. Smaller particles pass through; larger particles land on the surface and are blown clear as the flow direction is reversed. For this reason, the primary need for cleaning is to remove films of oil-based aerosols that have condensed on energy transfer surfaces. Buildup of material over time may eventually reduce airflow. Most importantly, in the case of desiccant coated (enthalpy) wheels, such films can close off micron sized pores at the surface of the desiccant material, reducing the efficiency with which the desiccant can absorb and desorb moisture. FREQUENCY In a reasonably clean indoor environment such as a school, office building, or home, experience shows that reductions of airflow or loss of sensible (temperature) effectiveness may not occur for ten or more years. However, experience also shows that measurable changes in latent energy (water vapor) transfer can occur in shorter periods of time in commercial, institutional and residential applications experiencing moderate occupant smoking or with cooking facilities. In applications experiencing unusually high levels of occupant smoking, such as smoking lounges, nightclubs, bars and restaurants, washing of energy transfer surfaces, as frequently as every six months, may be necessary to maintain latent transfer efficiency. Similar washing cycles may also be appropriate for industrial applications involving the ventilation of high levels of smoke or oilbased aerosols such as those found in welding or machining operations, for example. In these applications, latent efficiency losses of as much as 4% or more may develop over a period of one to three years. CLEANABILITY AND PERFORMANCE In order to maintain energy recovery ventilation systems, energy transfer surfaces must be accessible for washing to remove oils, grease, tars and dirt that can impede performance or generate odors. Washing of the desiccant surfaces is required to remove contaminate buildups that can reduce adsorption of water molecules. The continued ability of an enthalpy wheel to transfer latent energy depends upon the permanence of the bond between the desiccant and the energy transfer surfaces. Bard wheels feature silica gel desiccant permanently bonded to the heat exchange surface without adhesives; the desiccant will not be lost in the washing process. Proper cleaning of the Bard energy recovery wheel will restore latent effectiveness to near original performance. MAINTENANCE PROCEDURES NOTE: Local conditions can vary and affect the required time between routine maintenance procedures, therefore all sites (or specific units at a site) may not have the same schedule to maintain acceptable performance. The following timetables are recommended and can be altered based on local experience. Manual Page 16 of 21

17 QUARTERLY MAINTENANCE 1. Inspect mist eliminator/prefilter and clean if necessary. This filter is located in the fresh air intake hood on the front of the unit. This is an aluminum mesh filter and can be cleaned with water and any detergent not harmful to aluminum. 2. Inspect wall mount unit filter and clean or replace as necessary. This filter is located either in the unit, in a return air filter grille assembly, or both. If in the unit it can be accessed by removing the lower service door on the front of the unit. If in a return air filter grille, by hinging the grille open to gain access. 3. Inspect energy recovery ventilator for proper wheel rotation and dirt buildup. This can be done in conjunction with Item 2 above. Energize the energy recovery ventilator after inspecting the filter and observe for proper rotation and/or dirt buildup. 4. Recommended energy recovery wheel cleaning procedures follow: Disconnect all power to unit. Remove the lower service door of the wall mount unit to gain access to the energy recovery ventilator. 5. Remove the front access panel on the ventilator. Unplug amp connectors to cassette motors. Slide energy recovery cassette out of ventilator. 6. Use a shop vacuum with brush attachment to clean both sides of the energy recovery wheels. 7. Reverse shop vacuum to use as a blower and blow out any residual dry debris from the wheel. NOTE: Discoloration and staining of the wheel does not affect its performance. Only excessive buildup of foreign material needs to be removed. 8. If any belt chirping or squealing noise is present, apply a small amount of LPS-1 or equivalent dry film lubricant to the belt. ANNUAL MAINTENANCE 1. Inspect and conduct the same procedures as outlined under Quarterly Maintenance. 2. To maintain peak latent (moisture) removal capacity, it is recommended that the energy recovery wheels be sprayed with a diluted nonacid based evaporator coil cleaner or alkaline detergent solution such as 49. NOTE: Do not use acid based cleaners, aromatic solvents, temperatures in excess of 17 F or steam. Damage to the wheel may result. Do not disassemble and immerse the entire heat wheel in a soaking solution, as bearing and other damage may result. 3. Rinse wheel thoroughly after application of the cleaning solution, and allow to drain before reinstalling. 4. No re-lubrication is required to heat wheel bearings of the drive motor, or to the intake and exhaust blower motors. 5. If any belt chirping or squealing noise is present, apply a small amount of LPS-1 or equivalent dry film lubricant to the belt. Manual Page 17 of 21

18 Manual Page 18 of 21 FIGURE 1 THERMOSTAT WIRING DIAGRAM

19 FIGURE 11 TERMINAL BLOCK LOCATION Manual Page 19 of 21

20 Manual Page 2 of 21 FIGURE 12 HUB ASSEMBLY WITH BALL BEARING

21 Manual Page 21 of 21

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